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Path: utzoo!utgpu!water!watmath!clyde!ima!haddock!karl
From: karl@haddock.UUCP
Newsgroups: comp.lang.c
Subject: Re: Unstylish #defines ??
Message-ID: <1237@haddock.ISC.COM>
Date: Thu, 24-Sep-87 19:19:51 EDT
Article-I.D.: haddock.1237
Posted: Thu Sep 24 19:19:51 1987
Date-Received: Sat, 26-Sep-87 13:14:54 EDT
References: <325@petro.UUCP>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Distribution: na
Organization: Interactive Systems, Boston
Lines: 12
Keywords: quotes, files
Summary: Wait for ANSI

In article <325@petro.UUCP> jrb@petro.UUCP (Jon Boede) writes:
>#define FOO "/usr/me
>stream = fopen(FOO/afile","r");

It isn't portable, and so it's best to avoid this.  In pre-ANSI, the best you
can do is paste the two pieces together at run-time (with strcat or sprintf),
or #define each such path separately (#define FOO_afile "/usr/me/afile" ,
etc.), but in ANSI C string constants can be pasted at compile-time:
  #define FOO "/usr/me"
  stream = fopen(FOO "/afile", "r")

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint